Charles e



(No Model.)

G. E. SCRIBNBR. ELECTRIC ARG LAMP.

No. 420,109. Patented Jan.28,1800,

Iy'HI|lml|||||||||||||||||||Il|IlIIlII|Illlllllllllllllllllllllllll A:uuldlvl j Munn@ UNITED STATES PATENT OFFICE-.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE VESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 420,109, dated January 28, 1890.

Application led January 2, 1883i Serial No. 80,752. (No model.)

.To all whom it may concern.-

Be it known that LCHARLES SCRIBNER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented. acertain new and useful Improvement in Movable Magnets for Arc Lamps, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, formio ing a part of this specification.

My invention herein set forth relates to electric-arc lamps in which a regulating-magnet is attached rigidly to the frame of the lamp and a suspended lifting-magnet is employed, as hereinafter described and claimed.

In lamps now in common use, includingthose in which the lifting-magnet is wound -dierentiallyg one winding being a portion of the main circuit and the other a portion of a zo shunt around thearc, and also including those lamps like the Von Hefner Alteneck, (United States Patent No. 243,341, June 2l, ISSL) in which the lifting-solenoid in the main circuit and the solenoid in the shunt of the arc act upon the same carbon rod,the current of the main circuitA acts in opposition to the cur- 4 rent of the shunt of the arc. In all these lamps the armature of the lifting-magnet, in order to compensate ory feed, moves away from 3o the poles of said lifting-magnet. This movement of the lifting-armature away from the poles of its magnet, which produces the feed,

is caused chiefly by the variations in the strength of the current of the shunt of the arc. lAs the strength of the current in the shunt of the arc increases, the armature of the lifting-magnet moves away and causes the feed. The compensation for the inequalities of the current is caused chieiiy bythe varia- 4o tions of the strength of the current of the magnet in the main circuit. In my lamp, however, as herein described, the electro-magnet in the shunt of the arc does not act in oppo- Vnotlchanged, nor is the position of the armature of the liftingqnagnet-changed relatively to thepoles of said lifting-magnet, by variation4 in the strength of vthe electromiagnet in I 5o the shunt Vof the are.

The accompanying drawing, which is illusy i trative of my invention shows a front elevation of an electric-arc lampA The circuit may be traced from hook a by wire b, through the suspended lifting-magnet 55 c, and thence to the carbon rod cl, and thence through the are e and by wire f to hook g. The regulating-magnet h is included in the shunt of the arc and attached rigidly to the frame t' of the lamp, andl controls the regu- 6o lating mechanism of the lamp. The three pieces 7a, Z, and m, pivote/d as shown, form a kind of pivoted ari'nature-lever supporting the lifting-magnet C, the poles of which enl tend toward the lifting-armature n, that car- 'f6 5 ries the usual friction-clutch o. The liftingarmature n, with its suitable movable supporting` parts, is carried up and down with the lifting-magnet. It should therefore not i extend cit-her above or below the poles of the 7o lifting-magnet.- vvrIhe two ends of the liftingarmature come','preferably, opposite the centers, respectively, of the two poles, as shown. The armature p of the regulating-magnet is mounted upon the pivoted armature-lever. The frame is held suspended by means of the adjustable retractil@ spring q. Armature 'n of the main-circuit magnet is mounted upon armature-levers n', pivoted to the frame of the lamp. The clutchois suspended directly 8o upon the lower one of these two pivoted lef vers upon which the armature n is mounted.

The operation of my lamp as thus described is as follows: Assoonkas the circuit is closed, Y the armature n is raised by the lifting-magnet and the clutch o lifts the rod, thus separating the carbons and establishing the are, as shown. The action ofthe magnet h will at the rsame time draw upon its armature against the tension of spring q. The spring 9o q must thereforefb'e adjusted to `sustain its armature-lever and the parts it supports after the lifting-magnet has'raised the rod. The armature n will move as the magnet c n moves. '1 It has also a compensating motion 95 up and down as the strength of the magnet cy increases and diminishes. As; ther resistance of lthe arc increases,the regulating-magnet becomes more strongly magnetized, and the armature pis drawn downward, andalso piece loo l, which carries the lifting-m agnet c. The lifting-armature n, it is evident, will descend at t-he same time, thus compensating and feeding as the current varies or the carbons burn away. It will thus be seen that the current in the shunt of the arc acts to change the posit-ion of the lifting-magnet and its armature. This action is in no way opposed to the action of the current which is passing through the coils of the lifting-magnet. Increase of the current in the shunt lowers the armature jp and the lifting-magnet c just the same without reference to the magnetic force of the lifting-magnet-that is to say, armature n is attracted by the main-circuit magnet and assumes a definite position with relation thereto, which position it holds no matter what changes may take place in the strength of the shunt-magnet. Armature n, through the attraction of the main-circuit magnet, is connected through magnetic action with armature-lever klm, and the movements of this armature-lever in responding to the changes taking place in the electro-magnet in the shunt of the arc are communicated to armature fn, its lever, and to clutch 0. Thus it will be seen that clutch o is carried and controlled by the pivoted armature-lever k Z m and the pivoted armature-lever upon which said clutch is supported. The compensation and feeding of my lamp is thus more delicate and reliable than in lamps heretofore known or used.

I claim as my invention- 1. In an electricfarc lamp, the combination, with an electro-magnet in the shunt of the arc and its armature, of an electro-magnet in the main circuit and its armature, said electro magnet in the main circuit being carried upon a movable support, said support being con trolled by the armature of the electro-magnet in the shunt of the arc, whereby the position of the main-circuit electromagnet and its armature is caused to vary in response to the Variations in the strength of the current passing through the electro-magnet in the shunt of the arc.

2. In an electric-arc lamp, the combination, with a clutch suspended upon suitable movable supporting parts, an armature forming part of said movable supporting parts, an electro-magnet in the main circuit with its poles presented to said armature, a regulating mechanism pivoted to the lamp-frame and carrying the main magnet, and an electromagnet in the shunt of the arc with its poles presented to an armature carried by said regulating mechanism, whereby the position of the carbon-feeding mechanism is varied as the strength of the magnet in the shunt varies independently of the action or electrical condition of the magnet in the main circuit.

3. In an electric-arc lamp, an electro-magnet in the shunt of the arc, a pivoted armaturelever responding to the changes in the strength of said shunt-magnet, in combination with a magnet in the main circuit and a pivoted armature-lever responding to the changes in strength of said main-circuit magnet, a carbon rod, and clutch for the same, said clutch being carried and controlled by the said armature-levers, whereby the movements of either armature-lever may be communicated to the clutch to feed and regulate the lamp.

In witness whereof I hereunto subscribe my name this 29th day of November, A. D. 1882.

CHARLES E. SCRIBNER.

\Vitnesses:

PAUL A. STALEY, GEORGE P. BARTON. 

